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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c23bfc3835
Most PCI implementations perform simple root bus scanning. Rather than having each group of platforms provide a duplicated bus scan function, provide the PCI configuration ops structure via the hw_pci structure, and call the root bus scanning function from core ARM PCI code. Acked-by: Krzysztof Hałasa <khc@pm.waw.pl> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
/*
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* linux/arch/arm/mach-footbridge/personal-pci.c
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*
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* PCI bios-type initialisation for PCI machines
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*
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* Bits taken from various places.
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*/
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <asm/irq.h>
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#include <asm/mach/pci.h>
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#include <asm/mach-types.h>
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static int irqmap_personal_server[] __initdata = {
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IRQ_IN0, IRQ_IN1, IRQ_IN2, IRQ_IN3, 0, 0, 0,
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IRQ_DOORBELLHOST, IRQ_DMA1, IRQ_DMA2, IRQ_PCI
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};
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static int __init personal_server_map_irq(const struct pci_dev *dev, u8 slot,
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u8 pin)
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{
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unsigned char line;
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pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &line);
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if (line > 0x40 && line <= 0x5f) {
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/* line corresponds to the bit controlling this interrupt
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* in the footbridge. Ignore the first 8 interrupt bits,
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* look up the rest in the map. IN0 is bit number 8
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*/
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return irqmap_personal_server[(line & 0x1f) - 8];
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} else if (line == 0) {
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/* no interrupt */
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return 0;
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} else
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return irqmap_personal_server[(line - 1) & 3];
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}
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static struct hw_pci personal_server_pci __initdata = {
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.map_irq = personal_server_map_irq,
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.nr_controllers = 1,
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.ops = &dc21285_ops,
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.setup = dc21285_setup,
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.preinit = dc21285_preinit,
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.postinit = dc21285_postinit,
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};
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static int __init personal_pci_init(void)
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{
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if (machine_is_personal_server())
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pci_common_init(&personal_server_pci);
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return 0;
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}
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subsys_initcall(personal_pci_init);
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